Circularly Polarized Luminescence of Silica-Grafted Europium Chiral Derivatives Prepared through a Sequential Functionalization.

Author(s) Armelao, L.; Dell'Amico, D.Belli; Bellucci, L.; Bottaro, G.; Di Bari, L.; Labella, L.; Marchetti, F.; Samaritani, S.; Zinna, F.
Journal Inorg Chem
Date Published 2017 May 25
Abstract

We describe a new organic/inorganic material emitting circularly polarized luminescence (CPL). The hybrid system was obtained by the following steps: (i) preliminary grafting of the europium N,N-dibutylcarbamate [Eu(O2CNBu2)3] complex onto silica, (ii) substitution of the residual carbamato groups with anionic 1,3-diphenyl-1,3-propanedionato ligands (dbm), and (iii) subsequent introduction of the neutral tridentate chiral ligand 2,6-bis(isopropyl-2-oxazolin-2-yl)pyridine ((i)Pr-PyBox) in the metal coordination sphere. The solid material is stable to air and does not leach either the metal or the ligand. Samples of both enantiomers have been studied, showing mirror-image CPL spectra. The molecular compounds [Eu(dbm)3-(S)-((i)Pr-PyBox)] and [Eu(dbm)3-(R)-((i)Pr-PyBox)] were prepared for comparison purposes and their molecular structures studied by single-crystal X-ray diffraction, showing mononuclear derivatives with a coordination number of 9 for europium. Powder X-ray diffraction showed a single crystalline phase. Photoluminescence and CPL evidenced the presence of a single emitting species.

DOI 10.1021/acs.inorgchem.7b00611
ISSN 1520-510X
Citation Armelao L, Dell'Amico DB, Bellucci L, Bottaro G, Di Bari L, Labella L, et al. Circularly Polarized Luminescence of Silica-Grafted Europium Chiral Derivatives Prepared through a Sequential Functionalization. Inorg Chem. 2017.

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